128234439999 has 24 divisors (see below), whose sum is σ = 187565235312. Its totient is φ = 84411849600.

The previous prime is 128234439973. The next prime is 128234440003. The reversal of 128234439999 is 999934432821.

128234439999 is a `hidden beast` number, since 1 + 2 + 8 + 234 + 4 + 399 + 9 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-128234439999 is a prime.

It is a super-2 number, since 2×128234439999² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128234439919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1297689 + ... + 1393005.

It is an arithmetic number, because the mean of its divisors is an integer number (7815218138).

Almost surely, 2^128234439999 is an apocalyptic number.

128234439999 is a deficient number, since it is larger than the sum of its proper divisors (59330795313).

128234439999 is a wasteful number, since it uses less digits than its factorization.

128234439999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97207 (or 97204 counting only the distinct ones).

The product of its digits is 30233088, while the sum is 63.

The spelling of 128234439999 in words is "one hundred twenty-eight billion, two hundred thirty-four million, four hundred thirty-nine thousand, nine hundred ninety-nine".